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Too little or no pump
capacity
Blockage or an air bubble
in the pump
Check the delivery pipe
and the pump
• Delivery pipe (block-
age)
• Globe valve (half or
fully closed)
• Inclusion of air
• Blockage (impeller)
• Check level switching
Incorrect direction of rota-
tion
Reverse the direction of
rotation
Direction of rotation
Pump failure Check the pump • Coupling (leaking)
• Impeller (has come
loose or is damaged)
• Impeller or pump
housing (blockage)
• Bearings damaged
Power supply is unstable Check the power supply
• Switch box
• Fuses
• Undervoltage
High water alarm Too little pump capacity Check the delivery pipe
• Delivery pipe (block-
age)
• Globe valve (half or
fully closed)
• Inclusion of air
Pump failure Check the pump • Impeller or pump
housing (blockage)
• Impeller (has come
loose or is damaged)
• Bearings damaged
Current failure Check the power supply
• Fuses
• Undervoltage
Motor failures Check the motor
• Junction box
• Insulation test
Problem Possible cause Possible solution Checkpoints
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